You can nest one kind of control structure within another kind.
可以在一种控制结构中嵌套另一种控制结构。
As a kind of marked negation, metalinguistic negation is usually marked by the double-sentence structure, consisting of a basic negative sentence plus another positive or negative sentence.
元语否定作为一种标记否定，它的标记形式一般为由本句和义句构成的复句结构式。
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